All MCQs for Competitive Exams

921

Which of the following measures of dispersion is unitless?

A

Range

B

Mean deviation

C

Standard deviation

D

C.V.

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922

What is the mathematical relationship between mean deviation (MD) and standard deviation (SD) for a normal distribution?

A

MD < SD

B

MD =1/2SD

C

MD = SD

D

None of these

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923

The coefficient of variation can be calculated by using the formula

A

$$\frac{{{\text{Arithmetic mean}}}}{{{\text{Standard deviation}}}} \times 100$$

B

$$\frac{{{\text{Square root of standard deviation}}}}{{{\text{Arithmetic mean}}}} \times 100$$

C

$$\frac{{{\text{Standard deviation}}}}{{{\text{Arithmetic mean}}}} \times 100$$

D

$$\frac{{{\text{Standard deviation}}}}{{{\text{Geometric mean}}}} \times 100$$

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924

Match the statistical parameters in Column I with their corresponding values in Column II.

A

a-1, b-2, c-3, d-4

B

a-3, b-1, c-2, d-4

C

a-2, b-1, c-4, d-3

D

a-4, b-3, c-2, d-2

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925

In statistics, the variance is defined as the square of which measure?

A

Range

B

Standard deviation

C

Mean deviation

D

Correlation

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926

Given a sample size (N) of 9 and a variance of 169, what is the standard deviation?

A

3

B

13/3

C

13

D

169/3

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927

What is the term for the square of the standard deviation?

A

Coefficient of variance

B

Mean deviation

C

Standard deviation

D

Variance

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928

What is the mathematical expression for quartile deviation in relation to standard deviation?

A

None of these

B

$$\frac{2}{{3\sigma }}$$

C

$$\frac{3}{{2\sigma }}$$

D

$$\frac{4}{{5\sigma }}$$

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929

Which of the following measures of dispersion is considered unitless?

A

Mean deviation

B

Coefficient of variation

C

Standard deviation

D

Quartile deviation

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930

What is the standard deviation of a standard normal distribution?

A

1

B

1.96

C

0

D

1.645

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